Abstract:Bottom sediment is a natural trap for organic matter and different kinds of pollutants. The accumulation of large amount of organic matter gives rise to the eutrophication of the aquatic ecosystems. The analyses of the quantity and quality of the organic matter (biopolymers) help to determine the trophic status of coastal ecosystems. The Maricá-Guarapina Lagoon System (MGLS) is located in Rio de Janeiro and is composed by four connected lagoons: Maricá, Barra, Padre and Guarapina. It has been suffering impacts… Show more
“…Historically, the lagoon system had cycles of opening and closure of the sea connection through the site 'Barra da Emergência', usually regulated by anthropic means (Oliveira et al 1955). The lagoon system shows a broad salinity variation according to weather conditions and the opening period of the Ponta Negra canal (Silvestre et al 2017), with a mean of 18 ppt (Franco et al 2019), although the inner waterbody (Maricá Lagoon) often shows salinity levels close to zero (Guerra et al 2011, Laut et al 2019). The lagoon system has great socioeconomic importance for the city of Maricá, due to several activities related to recreation, tourism and fishing.…”
Section: Study Areamentioning
confidence: 99%
“…The lagoon system has great socioeconomic importance for the city of Maricá, due to several activities related to recreation, tourism and fishing. However, the growing urbanization at the margins of the lagoon system has increased sediment and sewage input, which, associated with the low depth levels and reduced water renovation, leads to its silting up and eutrophication (Cruz et al 1996, Rodrigues et al 2015, Silvestre et al 2017, Laut et al 2019, Toledo et al 2021. Other near lagoons show different salinity levels, such as the euhaline Saquarema lagoon system (mean: 27-33 ppt) and the hyperhaline Araruama Lagoon (mean: 46-48 ppt) (Franco et al 2019).…”
Mytilopsis leucophaeata is an estuarine bivalve native from the Gulf of Mexico and Southeast USA, and it was introduced in Europe, Asia, Caribbean, South America and Northeast USA, showing massive colonization skills. In Brazil, the single invasion records of M. leucophaeata occur in the city of Rio de Janeiro, i.e., in the Rodrigo de Freitas Lagoon and in the Marapendi Lagoon. We conducted a new series of fieldworks in estuaries from the Rio de Janeiro state in order to evaluate the propagation of this invasive bivalve, aiming sites with proper salinities for the establishment of M. leucophaeata. A new record is given for the Maricá-Guarapina lagoon system, where M. leucophaeata mainly colonizes hard substrata (such as piers and rocks), reaching a mean density up to 43,375 specimens/m2; however, aggregates of M. leucophaeata were also observed in the soft substratum. Based on mitochondrial sequences, the taxonomic identification of the invasive bivalve was confirmed. The associated fauna to the agglomerates of M. leucophaeata in the lagoon system comprises amphipods, barnacles, tanaidaceans, isopods, crabs, polychaetes and snails. The expansion of M. leucophaeata requires a continuous investigation due to the great circulation of boats in the littoral of the Rio de Janeiro state and the increased chance of new introductions.
“…Historically, the lagoon system had cycles of opening and closure of the sea connection through the site 'Barra da Emergência', usually regulated by anthropic means (Oliveira et al 1955). The lagoon system shows a broad salinity variation according to weather conditions and the opening period of the Ponta Negra canal (Silvestre et al 2017), with a mean of 18 ppt (Franco et al 2019), although the inner waterbody (Maricá Lagoon) often shows salinity levels close to zero (Guerra et al 2011, Laut et al 2019). The lagoon system has great socioeconomic importance for the city of Maricá, due to several activities related to recreation, tourism and fishing.…”
Section: Study Areamentioning
confidence: 99%
“…The lagoon system has great socioeconomic importance for the city of Maricá, due to several activities related to recreation, tourism and fishing. However, the growing urbanization at the margins of the lagoon system has increased sediment and sewage input, which, associated with the low depth levels and reduced water renovation, leads to its silting up and eutrophication (Cruz et al 1996, Rodrigues et al 2015, Silvestre et al 2017, Laut et al 2019, Toledo et al 2021. Other near lagoons show different salinity levels, such as the euhaline Saquarema lagoon system (mean: 27-33 ppt) and the hyperhaline Araruama Lagoon (mean: 46-48 ppt) (Franco et al 2019).…”
Mytilopsis leucophaeata is an estuarine bivalve native from the Gulf of Mexico and Southeast USA, and it was introduced in Europe, Asia, Caribbean, South America and Northeast USA, showing massive colonization skills. In Brazil, the single invasion records of M. leucophaeata occur in the city of Rio de Janeiro, i.e., in the Rodrigo de Freitas Lagoon and in the Marapendi Lagoon. We conducted a new series of fieldworks in estuaries from the Rio de Janeiro state in order to evaluate the propagation of this invasive bivalve, aiming sites with proper salinities for the establishment of M. leucophaeata. A new record is given for the Maricá-Guarapina lagoon system, where M. leucophaeata mainly colonizes hard substrata (such as piers and rocks), reaching a mean density up to 43,375 specimens/m2; however, aggregates of M. leucophaeata were also observed in the soft substratum. Based on mitochondrial sequences, the taxonomic identification of the invasive bivalve was confirmed. The associated fauna to the agglomerates of M. leucophaeata in the lagoon system comprises amphipods, barnacles, tanaidaceans, isopods, crabs, polychaetes and snails. The expansion of M. leucophaeata requires a continuous investigation due to the great circulation of boats in the littoral of the Rio de Janeiro state and the increased chance of new introductions.
“…This dumpsite received over 100 tons of daily waste, accumulating a total volume of about 558,000 m 3 of solid material, which extends through over 47,000 m 2 . The predominant soil type in the area is a cambisol originated from igneous granitic rocks containing low calcium content (Laut et al, 2019).…”
Section: Study Location and Leachate Samplingmentioning
demand (COD; 760 ± 6.6 mg L −1 ) indicating the presence of leachate, explained by its close proximity to the landfill cell. Pond L-03 presented higher parameters compared to pond L-02, except for N-ammoniacal and phosphorus levels, explained by the local geological configuration, configured as a slope from the landfill cell towards L-03. Seven filamentous and/or yeast fungi genera were identified, including the opportunistic pathogenic fungi Candida krusei (4 CFU) in an outcrop sample. Regarding soil samples, Br, Se, and I were present at high concentrations leading to high soil contamination (CF ≤ 6). Pond L-02 presented the highest CF for Br (18.14 ± 18.41 mg kg −1 ) and I (10.63 ± 3.66 mg kg −1 ), while pond L-03 presented
“…De fato, os maiores valores de COT registrados no ERC estão associados às regiões de sedimento lamoso e próximo a fontes poluidoras como a estação CH06-B localizada no rio Santana, e as estações CH09-B e CH09-C localizadas nas proximidades da ETE. Estudos realizados com a mesma metodologia em ecossistemas transicionais altamente eutrofizados do estado do Rio de Janeiro apresentam valores de COT similares aos encontrados no ERC como: laguna de Itaipu com valor máximo de 6.0% (Laut et al 2016b); Sistema Lagunar de Saquarema como valor máximo de 21,5% (Dias et al 2017); Lagoa Vermelha com valor máximo de 7,1% (Laut et al 2017); Sistema Lagunar Maricá-Guarapina com valor máximo de 4,3% (Laut et al 2019); e laguna de Araruama como valor máximo de 4,6% (Laut et al 2020).…”
Section: Granulometria E Matéria Orgânicaunclassified
ResumoO estuário do rio Cachoeira (ERC) é maior estuário do sul da Bahia e recebe efluentes domésticos, agrícolas e industriais de treze municípios nos quais são potenciais fontes de matéria orgânica (MO) e de elementos-traço. Os estudos de caracterização ambiental realizados do ERC não contemplam a avaliação e caracterização de elementos-traços biodisponíveis no sedimento e sua relação com parâmetros ambientais e hidrodinâmicos. Este estudo teve como objetivo fazer a primeira avaliação da distribuição da fração biodisponível de elementos-traço no sedimento de fundo do ERC, a fim de reconhecer compartimentos ambientais e sedimentológicos associados ao grau de poluição e/ou de degradação ambiental. A amostragem foi realizada em novembro de 2016 ao longo de 30 estações pré-estabelecidas onde foram medidos em campo os parâmetros físico-químicos da coluna d'água e separado amostras destinadas as análises granulométrica e geoquímica. O estuário do rio Cachoeira mostrou grande heterogeneidade espacial das variáveis ambientais que é resultado tanto de ordem natural quanto antrópica. A influência marinha foi evidenciada por alto valores de salinidade e pH que se estende até 11 km da foz. A influência antrópica foi perceptível no aumento expressivo do percentual de MO nas estações próximas a estação de tratamento de esgoto e nas proximidades aos rios Itacanoeira e Santana. Altas concentrações de elementostraço biodisponíveis foram encontradas no sedimento, com destaque para o As, Cu, Hg, Ni, Pb e Zn que estavam em concentrações superiores aos limites estabelecidos por agência de proteção ambiental. A alta concentração de elementos-traço na fase biodisponível no ERC é resultado da alta hidrodinâmica local que é a característica de estuários de meso-maré bem misturados.
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